Smoke-preventer for furnaces.



W. E..MOGRAW. SMOKE PBEVBNTER FOR FURNACES. APPLIUATION FILED rmms, 1908.

1,002,725. Patented Sept. 5, 1911.

2 BHEETS-SHEET 2.

lJNl it jj WILLIAM E. MCGRAW',

Oh CLEVELAND, OHIO.

SMOKE-PEEVENTER FOR FURNACES.

' Specification of Letters Patent.

Patented Sep't. 5, 1911.

Application filed February 28, 1908. Serial No. 418,211.

To all whom it may concern:

Be it known that I, WILLIAM E. MC- Gnnw, a citizen of the United States, residing at Cleveland, in the county of Guyahoga and State of Ohio, have inventetha certain new and useful Improvement in Smoke-Preventers for Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to devices employed for the purpose of preventing the liberation of smoke from furnaces during the operation of stoking and for a short time thereafter, suchdevices being known generally to the trade as smoke consumers, and has for its object to provide an eifective construction whereby air may be injected. into furnaces at the time that the door is opened for the purpose of stokmg or firing and to cause the supply of such air for a predetermined length of time after the closing of the door.

Further objects of the invention are to provide means whereby the supply of the injecting; fluid and the air may be quickly cut oil at such time as the injecting fluid becomes materially reduced in pressure or wire drawn.

Further objects are to simplify and improve the construction of the operating connection between the furnace door and the air-supplying means, the. regulator by means of which the length of time that the air supply shall operate is controlled, and generally to improve the construction of the means for supplying the air to the furnace.

Generally speaking, the invention may be defined as consisting of the combinations of elements embodied in the claims hereto annexed and illustrated in the drawings forming part hereof, wherein Figure 1 represents a front elevation of my apparatus showing the same applied to the front of a furnace; Fig. 2 represents a sectional view on the line 2,2 of Fig. 1, the furnace wall being shown in section; Fig. 8 represents a transverse sectional view through the front of the furnace onthe line 3 of Fig. 1;and Fig. 4 represents a sectional view near the inner end of the port through which air isinjected into the furnace.

Describing the various parts by reference characters, 1 represents the front wall of a furnace, said wall being provided with a furnace door 2, and with a sutticient number ot tubular ports 3 extending therethrough for the supply of the air necessary to sup jecting pipe 6 projecting into a port 3, the

lnjector pipe pro ecting into the hub 7 of theinner fixed member of a rotary damper by means of which the pipe is supported and centered within the port 3.

8 denotes the outer rotary member of the air damper. Members 7 and 8 are provided with segmental slots separated by correspondingly shaped solid members whereby. by rotation of member '8, air is permitted to flow through the segmental slots in member 7 or to he cut off from said slots in a well known manner.

9 denotes a link which is'pivotally connected to one of the segmental plates 8 of member 8, the opposite end of said link projecting through an elongated slot in the vertical arm 10 of the bell-crank lever 10. The end of link 9 which projects through said bell crank lever is threaded and is provided with a pair of nuts 9 which may be adjusted alongthe threaded end of the link to form a lost-motion connection between said link and lever 10. 9? denotes a second link by means of which another damper (not shown) may be operated by movement of damper 8. v

Pipe 4 is provided with a. valve 11. which may be of the butterfly type, said valve being provided with an operating handle 12.

The outer end of handle 12 is slotted for the reception of a valve operating rod 13, which aperture in the forwardly projecting portion r 18 of an l -'shaped operating member, being adjustably connected to said member by means of collars 19 applied to said rod above and below such projection. The lower end 20 of the other portion of such L-shaped member is adapted to be operated by'a slide 21 mounted in a. horizontal guideway 22 formed on a. plate 22 and the said slide is connected by means of a link 23 with the furnace door 2. Slide 21 is provided with an'inclined surface 24 adapted to engage a correspondingly inclined portion 25 at the lower end of member 20. 13 is carried by the above-described L-shaped member, as will appear from Fig. 2.

The lower end of rod 13 projects downwardly into the cylinder 26 of a dash pot and is connected to the piston 27 thereof. This dash pothas at the lower end thereof a plurality of ports 28, which ports extend from the bottom of the cylinder upwardly a 1 distance greater than the depth of piston 27.

Piston 27 is provided ,with a plurality of ports 31 and 32, there is applied a valve 33,

which is carried by the cylinder and by means of which the flow of liquid in the dash pot from bottom to top thereof may beregulated.

As will appear by reference to Fig. 3, the port 3 is inclined downwardly and the injector is correspondingly inclined. This pipe is provided at its discharge end with a cap 6 having a plurality of perforations therethrough. 4 'l The impingement of the steam and air injected through the ports 3 upon the boiler has been found to be greatly detrimental to the boiler. such impingement, I provide port 3 wit-h a deflector 34, which extends from a point adjacent to the discharge end of pipe 6 to the endof the port, being inclined downwardly or toward the center of such port from about the end of the pipe 6 to the discharge end of the port. The lower flat surface of 34 provides a deflecting surface which causes the steam and air supplied to the furnace to be directed downwardly, thereby preventing the impingement of the same against the For the purpose of preventing.

and with it rod 13, and extension 13*. The

this elevation of rod 13 without any material obstruction by the dash pot. hen the furnace door is closed, weights 16 cause rod 13 to descend, such descent being retarded by the dash pot. The length of time re .quired for the lowering of rod 13 and the c'lbsing of valve 11 will be determined by the weights l6 and the restriction of flow through port 32 by valve 33. By reason of the lost-motion connection bet-ween rod 13 and bell-crank lever 10 and between said lever and stem 9, rod 13-02111 descend for a predetermined distance, with a predetermined closing of the steam valve, before the air valve will begin to close. Thereafter; there will be a proportional supply of air and steam up to the final closing of the air and steam valves. By means of a suitable number of links 9*, any desired number of air valves may be similarly and simultaneously operated by the dash pot and fur nace door. After the steam flowing through the pipe 1 has been out down by valve 11 so that its pressure is comparatively light. any further operation of the injectors is detri 'ized, a-nd the rod 13 drops to its lowermost position, quickly cutting off the supply of steam through valve 11. As previously pointed out, spring 30 is a flexible spring which holds valve 29 in engagement with its seat, but permits such valve to open as the piston moves upwardly to equalize the pressure on both sides thereof.

From the foregoing description, it will be apparent that I have provided a particularly simple and efficient construction for supplying air to furnaces to promote combustion therein and for automatically cutting off the supplynof the said air and the injecting fluid at such time as will render the operation thereof most effective. By the lost-motion connection between the steam valve and the air damper, air may be supfurnace at a time when the maximum sup ply of air is desirable.

By reference to Figs. 3 and 4, it will be seen that the steam injector is not a single continuous pipe, but comprises two parts, 6, 6, connected respectively withthe outer and inner faces of the hollow hub 7. This hub is provided with discharge nipples 7 corresponding in position and number with the slots through the inner memberof the air damper. The purpose of this construction and arrangement is to facilitate the supply of air through the air port by means of the injector. Owing to its length and to the limited area covered by the injector pipe 6 in its operation, air may not be supplied in sufiicientquantities through the damper.

By locating the nipple 7 closely adjacent to the inlet end of port 3 and opposite the air slots in the inner member of the damper, air may be supplied to the furnace in ample quantity by the act-ion of the injectoras a whole.

aving thus described my invention, I claim:

1. The combination with a furnace having a door, of means for supplying a fluid thereto to promote combustion, said means comprising a pipe for sypplying such fluid, a valve in said pipe to regulate the flow of fluid .therethrough, a nozzle connected with the said pipe, a port in the furnace into which the nozzle projects, a valve controlling the admission of air to said port, a lost motion connection between the last mentioned valve and the former valve, and means operative upon the opening of the furnace door to open the valves, and means operative when the furnace door is closed to into said port, a valve in said pipe, a valve,

for said port, a bell crank lever, a link .con-

nected at one end to the said air port valve and at its opposite end having a loose con-.

nectiomwith one arm of the bell crank lever, stops upon the said link and upon opposite sides of. the arm of the bell crank lever with which said link engages, a connection between the second arm of the bell crank lever and the fluid supply valve whereby the valves may be operated simultaneously, and means for operating said valves.

3. The combination with a furnace having a port for the admission of air, and a furnace door, of a fluid supply pipe, an injector carried by said pipe and projecting into said port, a valve in said )ipe, a valve for said port, a link connected t ereto, a bell crank lever having one arm connected to said link, a second link operatively connected to the fluid supply valve and having loose connection with an arm of the bell crank lever, stops upon the link and upon opposite sides of the bell crank lever, arms with which the said link engages, and means for operating said valves.

In testimony whereof, I hereunto afiix my signature in the presence of two witnesses.

WILLIAM E. MGGRAW.

Witnesses J. B. HULL, W. HENRY PAE. 

